>cd03131 GATase1_HTS Type 1 glutamine amidotransferase (GATase1)-like domain found in homoserine trans-succinylase (HTS). Type 1 glutamine amidotransferase (GATase1)-like domain found in homoserine trans-succinylase (HTS). HTS, the first enzyme in methionine biosynthesis in Escherichia coli, transfers a succinyl group from succinyl-CoA to homoserine forming succinyl homoserine. It has been suggested that the succinyl group of succinyl-CoA is initially transferred to an enzyme nucleophile before subsequent transfer to homoserine. The catalytic triad typical of GATase1 domains is not conserved in this GATase1-like domain. However, in common with GATase1 domains a reactive cys residue is found in the sharp turn between a beta strand and an alpha helix termed the nucleophile elbow. It has been proposed that this cys is in the active site of the molecule. However, as succinyl has been found bound to a conserved lysine residue, this conserved cys may play a role in dimer formation. HTS acti

Probab=92.55  E-value=0.16  Score=31.43  Aligned_cols=63  Identities=14%  Similarity=0.202  Sum_probs=41.8

Q ss_pred             CHHHHHHCCCCEEEECCCCCCCCCCCC----C---CHHHHHHHCCCCCCEEEEECHHHHHHHHC-CCCCCCCC
Q ss_conf             744644135788998588888410112----1---10122210257863478610058878752-85446677
Q gi|254780420|r  238 SYKDIMSLQPDGVLLSNGPGDPAVTSV----Y---SSPIICKLVDSGMPMFGICLGHQLLGLAL-GAQTVKMY  302 (396)
Q Consensus       238 ~~~~i~~~~pdgi~lSnGPGdP~~~~~----~---~~~~~~~~~~~~iPilGIClGhQ~l~~a~-G~~~~kl~  302 (396)
T Consensus        54 ~~~~i~~~~~DglIITGAP--ve~l~fe~v~YW~El~~i~dwa~~~v~stl~iCWaA~Aal~~~ygI~k~~l~  124 (175)
T cd03131          54 TFDDIRDAKFDGLIVTGAP--VEHLPFEQVDYWEELTEILDWAKTHVTSTLFSCWAAMAALYYFYGIKKHQLP  124 (175)
T ss_pred             HHHHHHHCCCCEEEEECCC--CCCCCCCCCCCHHHHHHHHHHHHHHCCCEEEEHHHHHHHHHHHHCCCCEECC
T ss_conf             4998741777668971899--8878834387799999999999873663345649999999998399840068